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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e154015b359063a110bf08e851ec21283d958c0c8429006d906e2cc7c5498c6' 
  AND token = 'Kza7QskT6Nd6MWPuJFGvDPawTLEpomz1aeOjh4Es9wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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