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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03eb0ea0a6ce21fb055611ed90a04f8525d0266e1d2109fb81a43a1ce4542b17' 
  AND token = '9bQA9QV0QlvNOx/UXa4ibmZoIEm5HfLJSTr38PqCr0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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