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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75485d15a59a5a6eb971da2a65dcc18b8202e8c7f14bbb1489aa76f3596912f5' 
  AND token = 'yfbEVxsrG6sBNUczkZ1LD+CvqY8GaENGMNVN0T1b1Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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