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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46ce4e2008ae3d35c7ac517804d7abe731e52962c1b8311ece7f615d41cb64a9' 
  AND token = '7RVW6uert3/EwVCzYEm+a4fz+7HhlYHrFYLIwor9T7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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