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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '393e86b6919cae6d35a98c470bbd8387dce17e88105974b610d82df65211440a' 
  AND token = 'ADFoT6H2FV7JCRBxe5udjKWdE6t5zPqOmfbxY4PW+kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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