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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50bd6e7fc313d42a4b9b686b8466785a3015e082f0923a49856ba054f2411281' 
  AND token = 'yKpD0P7LON5wrVzkkxh8RPfYdPi3St+XW5zb0FF17P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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