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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f87961cd5fe9dfdca41b492c9fc682b4d2e518a1d5295e2e4add50873147c9' 
  AND token = 'JMkxOMRlFULnFbs8MYBrP34/kBaNhOrZ1XmFOLHedvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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