SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a8248779ea42472b2530513630c10aa5cb13b54edfa06271ab817426e85afc5' 
  AND token = 'kzbKbOpqgwkoNCGHMFhO/IAsaaDBcTzM3YikRcQPpvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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