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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b12b1a2230598d9b287f858cf1e552f7f9282aeba6f1230c542ae6b06e85a7d' 
  AND token = 'tHcGytT+GL+YbCsG5zU9s7OLZgKRWHOkMUGUeV3egAQ=' 
  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"
    }
  }
}