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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24e753a6f3f2c6f2d702264d8f325d26e5d91be78fe0eb770d18dd3623914d39' 
  AND token = '5AS8zZVVUYxI9aKAy9GgHaHHhq9e3oRZ93QDSxsjU4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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