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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e87430ccf6ac5cf1c8330a7b3597c42d55b681aa3114c5e655a34c1e33d39d6' 
  AND token = 'U6YPq3RLJXCwWMFyPFaElW/2UVtjM3zoON2JujKQyDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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