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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fc834308891e28f60f8b082a162a7e2ca7c943f74ba1a6e36407a6b654c0cdb' 
  AND token = 'vrFNOlIlwhAfx2U98SdIWhQbcTy8k/xrARa3D4msHYw=' 
  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"
    }
  }
}