Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a63a85d1e7f8d59a52bf584835226c76a960dcce0accd5c5fcb37b2211e180fa' 
  AND token = 'd3yyNaZGi9rnQQEiErldmmwho0+WJtiUgrQb1rF7IKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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