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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15db7e5c7095b3a2a9868a2ead259cfa7ebadd9a68342ec3a0937e91c3726d71' 
  AND token = 'gYxxidYjI5qe9D0ie18x5dyMFbm7wFERsteMLxOZrOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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