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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bafdba5d5cb6f17932b5649fea6cbf827438afd0f36a79aa171f98bc45caa782' 
  AND token = 'qndNAd6CwYf+Cw738fQiJI0c+B7DTzBfnM8msU+nU38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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