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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feb60d35bd2638002383f5ee71503652ec31dc0d05e70f7d6bf2fa106fb001a5' 
  AND token = 'dilfRqt6PpD0W0FY2j78TgHMtivqmONcth4aRoVdguc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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