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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4cff2938ef26477cb77d70398bbb29356d8d1e0e5f1a0cd418683c313e6c8d8' 
  AND token = 'T6nDiydemvk+9/cDAHPON0phNhd2RUCgAaXsVQgA34w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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