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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afdc5321399b117d8baf47db27f55123fe4c22cdd89bfd2987bfeb420f882874' 
  AND token = 'XBQOSk5trZcB0n7ex7i6AqnpZTn7x2kzhebnWJxve1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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