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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9499ff88d0f7f7c460e4d8bdf63ef62f03ad157b6396f6c6bf5334e38e7851a8' 
  AND token = 'mNMdYtctc+xuznWOKgY6FtccyXrx2bRBwwXqHjupkDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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