SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da1809f96cea2a670944c1455a8687af637673b1de451893149fd428539edb8c' 
  AND token = 'qbCT/pZ5GamP2ug6R0tvwB51mEvGeqQ1OMYboxCHmaA=' 
  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"
    }
  }
}