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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be285f7eb8d98dd2e47973c2369c8b9e40bcccc12b1de75adfdae4bf9d1c7e9b' 
  AND token = '9nJzCrZ5oHf0vYXIKRtZbdjg+EcsviKp+7vH+ok5xPY=' 
  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"
    }
  }
}