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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e800d07be2e37a6f606f42f68f76b8a2430beb966fd6f2ac43d73e0cd3c1f43e' 
  AND token = 'KqPV0L7NbuHnPJcy/L8Ns882ujUgrU/fuoqU6dm0aVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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