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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c48ee57582ee34aed2c448d9f6dc03935ef185485913313bf1a58d574a44885c' 
  AND token = 'Pfmjr9zDTWDofl2SfUvmoZEEd0hTzD/r0cMp3vEXIO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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