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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035ebbedb9477c0c60082947923a7a70bbc9b6682c1ddacc7397f6d8b8d9a48c' 
  AND token = '1SAtpdADnhNRS4o9zI1yNhKX5OcFyfwRrXNL3tkGd8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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