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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038e5e6318788af35763baa292a8d61cedbc99d9d652686fa2efd15cc96755e3' 
  AND token = 'WvRtlvkge3EYKrc33RvW7pLM0w8cza+0iUic4pJ96aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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