SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95ddeffd2ec916ef94b50ec8b908351a2eee509260bd044a47d5ae3c3cd42f94' 
  AND token = 'JGW9sXEYJSw0Zcp0N7+hCTvugKmNXVChjWzUSwBitOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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