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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa79fc9a8e53aa7f0fbb97fc449bc5c9ee450b5a4867932daed25e3087e7c31a' 
  AND token = 'Lg9UqKPkWp973W0YqCMsT1JMbDSLwmm7jYfBOoE4n7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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