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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fc65ce7c5bb1d7cd86043fac4f9c628ff5819b9c8b713593bc0760918072f1e' 
  AND token = 'H+33/3HzffZqSTFLKK2pxoJa4P6bL9YujWuKoo07aAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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