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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8873269fd3e661655f637bf58ab1e71790c11c9e53ea0cf6b5a69fc66c2d54da' 
  AND token = 'K+wT///4iibswDuJlyZYI8g/ae8tKD2C6kZ2T8ngC/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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