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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb88f085c2834ac0637f301f65b2ef930d3fe3cb292e6418171201fb8995c559' 
  AND token = 'NejlU2BoTXd+QM9vI8zGn635uF9fWbXQ6jK8LKMnW48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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