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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dc99fd60b81a5cce17e41800d5a3327d488414c8fdf40dcc76a180b74da6b36' 
  AND token = 'lxC9rOusyHCnZHgRv6AIqPJh1gxRHkk21rBjfrEauPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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