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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f40b625edf2f54125c82ed0a912b97b0497565ca6bcd3c1744c57c8c9ef7e5b' 
  AND token = 'B0QO/WK+QcPU7nRV9IfVMyL+rq7CAlJvuCLbDfHtMR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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