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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '462efd0daef2511e9224e7ed791a45873cb5f030c0a587600b827807933e09a6' 
  AND token = 'gbJHwq5cvGpYDIt7t0oO2vCt+AXQNvaUWO85aKd0xD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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