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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f14929fab7a618af13b7980fceab34f52518b9d7ba01b52c312ee69a88beada' 
  AND token = '2NX08FMNKq9jeZsW785kaJ8kWHcaiMlN+7Ua4uz1yIA=' 
  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"
    }
  }
}