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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b0d9c7fabfad0f1a1480638697c86f5330e41054ce561dee996c91fb11a12a' 
  AND token = 'tHD7BPoYU1LmunNvjXhu1bDkE6CYEEzM2tb+pSvrqe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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