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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1a149dba5e71a7ad3566d46186a02e7360deac8bd9b72f8a5c491935570d96f' 
  AND token = 'KD1M5ZO2h2JE7LplBtjMiQdeNLs6mRFvQEDP9KkDV0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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