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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf077ca5281d1e8999d2da12696035cf62dcba5fdf0673bacbb1cba474044e9' 
  AND token = 'CVKoGQC45WWGBFiUqRpS0qyUUsbTB9/CG7p9hz29VaU=' 
  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"
    }
  }
}