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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a21bc9ac4643087fa78604430ea58a6ebb1d00cf12af0d4c4270450f28f24a1d' 
  AND token = 'lR9td48mH8kFb7YOiAx6gs5CItiwo54sg54kNVcQiK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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