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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcce7c3d1f7d4c9f6d02dc324d9fdd1252d45d93cf532da94a475d98f0a9224f' 
  AND token = 'lE8mppfnU0O2AJqwiriZafvqFqQIHu3zYMZSfb8tm+I=' 
  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"
    }
  }
}