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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8cbcdd8cfa74fbfa66db7ed325d3a36f960039eec6386aecf2bb9b00340be1e' 
  AND token = '2lYde5RReXoeTnCIOyV74KUMUw3/8GE9260+noVIzmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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