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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f05f49188226997caacd8dd8d70f63d617506d2a23c656030aee62cc87fc4842' 
  AND token = 'CVuOLxYt6oOCBwf8hPwQ/rvEKAuNYfP2oNy5E059lmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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