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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc703304a3070ce07d5563d57377a8f9ba968447d48bdff6378c73bcbf286bd' 
  AND token = '9bebEISL0k74sYPAEBl1PZAZ1HS/eZbAICu109JL/aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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