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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a538a4a92bf3f289a63d430fbb5fd9859a720c87907531900fa41b1a2d14efa0' 
  AND token = 'WZxbs/+e8U1Rfs5wSOWzHotm6hjzv3IN39GAgIBS5ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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