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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ffff352dce7f4139d7c87aa4faae4d7ce145f580e6883acd286dc9e18cf00ba' 
  AND token = 'tqQJ2xN+pQHmVqcBkcIWHiLgY0UhqpL7W4/5nIfg7LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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