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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6c25f73d62c83c5e0c4a7a39d6323b5240535f9f96f2f98ab9393e38b6cdaf9' 
  AND token = '9RpxkDLz63Rau/a6ngKs6vIOEiVMR3fzYUTPv34OQcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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