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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cbdb01c66a301ceb3ba0fa3d8921a4d1b5e48d4139f4ba83fa95fc4850e7435' 
  AND token = 'YnHhQVxduFuirnW6tLSW7NG1JTjdpiuxdJ7N/7OeJPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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