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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e6b6bb6d3a94b3b6b8fb270c0432c1582510b757b74d095ba21e35da2c2d1b' 
  AND token = 'br6IHoQWBc+kzzmQ/J7oJ/HBOC+fEBg7iqJucl6IUOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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