Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c3cc2dca707732d7cfb98f2bbe95d719f7380b718092f667d3aadb41c5f451c' 
  AND token = 'AeYN3ZRVFwMVoy4ThTTTLywbfXL3fDQl/bvsYwk34fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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