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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d0fad53b8e94156dd92160426aa0151a95f9b49d4c3f5761c64fe9a7c431d47' 
  AND token = 'YyUZjSw145IaalojUUrALMAtMBSwxc2fLKteNoKzslA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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