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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cab562db50e6d8b50457edcf2526c4767d9d77a063c4df9c2630d384d69f1a1' 
  AND token = 'l0N34c2CFx0/KiIw5SoZBwv5QFUrZ1Su1Ihypj1e/ME=' 
  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"
    }
  }
}