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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd06a9324bd33f3bbd58212628ce34381e129479d82dafd0831ef3f810c487f' 
  AND token = 'AjBF5hRTOgVkbVfUTk7cVf5N3301M5lC1UkS6vdCLXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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