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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7924f0c219ffc63b813bc79945324a8b3cb1679b06845d1784048bb0e77af1b3' 
  AND token = '68BXXc4I6aldh6yJ1L9Mh2LoaPqLi2nJanHS0Emcg28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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