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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a810d20fd1d9080968f8984ef537f83b04e12eda8b42301444a05043d2ef28d' 
  AND token = 'Swbue9khap0ucRVywLTYhxAxyR8A/RH+zSh1mquzfdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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