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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd69a54982250239e6142515cffa66d037310ee673d290eeba8e729836d79c426' 
  AND token = 'i1nfrff4K/sF521DNbvZPN9CRnRaYnoy8ICT4FTktQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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