SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa5a2f67f4f73580a84c22d9711ef896c4ffec580e875f6628b33787c9d2b9c5' 
  AND token = 'X3uLoRuVYbP+oty/h56DJrzGZ9jYCg9AJVFLiawy1NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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