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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d1a95b569f153c265a8c3130c3383a8900e75308de8c4cb64345def396f243b' 
  AND token = 'UBcDYfwspWP8eFqr+pyc7soGo5+Al3svPnTzpF38fMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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