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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '480014ad8b0e94bec06da53eb81033ab4a41fad317e08d2df065a19de8ca4afd' 
  AND token = 'UZPz1L8G3lJS7dtyr05Zg9rSliq8IRwmGut5MziOQ6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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