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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97004d73e4eb7b7d82cce09773ffa09add48f073189d6c7f9fcff3a2cf8c892' 
  AND token = '0a0SvX4zKCnDu82zo3U7ACvJGWUFhc6wpwgzn/G0r7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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