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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd44cacf47727f55c239555ae23b56e8afba39655e24ffe3b4f7ab7c8a5b6e45c' 
  AND token = 'ROJK1U9JsqAnNsE0jy+hP2IYe2NnlNMm0zgwzTZ37f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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