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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6538dd82c5293739d435493b1d5399bafde6e02c96958005ab873eef2e8c85' 
  AND token = '+DtBsBI6t9AEYvjdUdRdqOlqQAXtHw1s23LAQpx5aPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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