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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67c48bc897ee2112277a198f7c8ec441f54bfea15457f9aa76c35aabe0c7f76e' 
  AND token = 'jcYHEWVCFFMbe8nLkQowyLToss/a2IW4JM75TmrbRxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}