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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2272e85b438cdaf17b9f7939edbc52d340e55c783b35571cf581d0dd998d93e7' 
  AND token = 'TcfDT8ZzssYtyHXXZ6UtH7h4lmq5Evtf4DX/M/VmAJQ=' 
  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"
    }
  }
}