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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99a28562d43318258e1817372a5b3738fefe95fc842583b38523c74275243e35' 
  AND token = 'MO1ArMQgIHizF73vbrX9Oqli9JC3am/fNif8sl6Au/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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