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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aff62f35e266f11b76c24cae6584dec43951c1995b8b2bcdded4d88969def4a' 
  AND token = '7XGwlp2cbGqi3ijJVgsdrycvuy9wo2pVhiE7UHJGR6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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