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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba74caac12667124c39c43c80f9dad9b7bcd672e2a70c7025cfe4687ac81bdd' 
  AND token = 'DP5uDamtuEpSwZ5K3EsPWH1qr7/EoIq5a0S5MAkCp4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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