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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa68a943eeba919c914a2989e4979373fd9b35ab7c422948a068c3b5ae37de6a' 
  AND token = 'QVTi23LcAo5d51Zc4tNLyw/Yp+ViLNbbY0PcGtmhdFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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