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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '332722002d0dc96a00571ff9e4f68829dfeeb30ee013086c7a61dd9a5ef43592' 
  AND token = 'Tm35ae4HJJ5SlS8G35oMQHCwEQEE+hItmkbCL7+DaaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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