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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd34b28e5ff6973d2d21d7f75b3d9831fde609abb8e1475820af31c68a02c6852' 
  AND token = 'Ief3QG3HI6YmCKA4XngwT8UQMYE2K2bM4zBoQcdw/sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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