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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdf3bcc612087bf7397d3bbbdba7d449dd4f3c5e732b99422a205dd0f2b2e4fe' 
  AND token = 'bR0XwcmWG3TMsXcJLPI6pQ4Z3Qyx74N9gDrN09bT4Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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