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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fabe2f3e0933cb5162d61d36e8ea365b09fb70c575c23e46ace31072a856890' 
  AND token = '6nYKNQzl3zRrHozg8u178I0GWT9RpxA/eCa+o64SsTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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